(123x456-23x46)x(12x9-4x27)

=.......x.....

=0

( 123 * 456 - 23 * 46) * (12 * 9 - 4 * 27) = 55030 * 0

                                                        = 0.

`x xx 12=456 xx 16`

`x xx 12=7296`

`x=7296:12`

`x=608`

`-------`

`x : (23xx6)=9`

`x :138=9`

`x=9 xx 138`

`x=1242`

a)

`X xx 12 = 456 xx 16`

` X xx 12 = 7296`

`X = 7296:12`

`X=608`

b)

`x:(23xx6)=9`

`x:138=9`

`x=9xx138`

`x=1242`

3) \(-12+2x-9+x=0\\ -21+3x=0\\ 3x=21\\ x=7\)

làm mỗi câu 3:V

tách ra

\(1\)) \(5-\left(10-x\right)=7\)
\(10-x=5-7\)
\(10-x=-2\)
\(x=10-\left(-2\right)\)
\(x=12\)

\(2\)) \(-32-\left(x-5\right)=0\)
\(x-5=-32-0\)
\(x-5=-32\)
\(x=-32+5\)
\(x=-27\)

12 : 3 = 4 x 4 = 16

20 x 3 = 60

90 : 1 = 90

123 - 123 = 0

10 x 9 = 90 : 9 = 10

12 - 9 = 3 x 9 = 27

23 - 5 = 18

123 + 12 = 135

1000 - 200 = 800

333 - 111 = 222

\(20.3=60\)

\(90.1=90\)

\(123-123=0\)

\(10.9=\frac{810}{9}=90\)

\(23-5=15\)

\(123+12=135\)

\(1000-200=800\)

\(333-111=222\)

 x + ( 123 + 456 ) - ( 23 + 56 ) = 789 

x+579-79=789

x+579=789+79=     1568

x=1568-579=989

nhớ kick cho ình nha

Tìm x  :  

x + ( 123 + 456 ) - ( 23 + 56 ) = 789 

x + 579 - 79 = 789 

x + 579 = 789 + 79 = 868

x = 868 - 579 

x = 289 

0

6456 x 0=0

bn ơi là bằng 0 nhé

nhớ cho mik điêm nhé

mk chi chep thua so thu 3 thoi nhe con 2 thua so con lai giu nguyen

42/30.75/23-19/23.210/38

=7/5.75.1/23-1/23.19.210/38

=7.15.1/23-1/23.210/2

=105.1/23-1/23.105=0

gia tri bieu thuc=0